The problem of bidirectionality in bianisotropic media, i.e. existence of plane
eigenwaves propagating forwards and backwards along a certain direction with the same
propagation factor is discussed. It is shown that bidirectionality in bianisotropic
media exists for the following directions: (1) perpendicular to a plane of symmetry,
(2) perpendicular to a proper axis, (3) along an improper axis, (4) parallel to an
antiplane, (5) along an antiaxis of symmetry.

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